,1998 ford ranger

Asked by GuruNXYP9 Oct 22, 2019 at 04:40 PM about the 1998 Ford Ranger XL Standard Cab 4WD SB

Question type: Maintenance & Repair

Removed cat shop made muffler
pipe schedule 40 down both sides
runs rough backfire constantly
worse when accelerate

2 Answers
101,575

KenF answered 4 years ago

The ECU needs to be tuned to a custom exhaust, and you can't really tune a factory ECU, you may have to go to an aftermarket one. The ECU is expecting some amount of backpressure, and is relying on O2 sensors to dictate the air/fuel mix, and without knowing exactly what you did, your intake and exhaust were bound to have some issues.

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